Display screen or portion thereof with a graphical user interface



4. Display screen or portion thereof with a graphical user interface

4 ) Front

Reproduction 4 is a front view of a display screen or portion thereof with a graphical user interface showing our design. The outer perimeter shown in broken lines in the figure illustrates a display screen or portion thereof and forms no part of the claimed design. The remaining broken lines in the figure illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 